Exhaust-nozzle



2 Sheets-Sheet 1.

(No Model.)

l J.PLAYBR EXHAUST NOZZLB.

Patented Apr. 7, 1891.

63S es Y @@7777 Playev (No Model.) .2 sheets-sheet 2. J. PLAYER.

EXHAUST NOZZLE.

No. 449,825. Patented Apr. 7, 1891.

w25/eases.' @gewi/r' @702m 2D/ayer TME nanars Hens no., Pnufxru'ma, wnsulmnou D c UNITED STATES PATENT OFFICE.

JOHN PLAYER, OF TOPEKA, KANSAS.-

ExHAusT-NozzLE.

SPECIFICATION forming part of Letters Patent No. 449,825, dated April '7, 1891.

Application filed December 22, 1890. Serial No. 375,452. (No model.)

nee county, Kansas, have invented a certain new and useful Improvement in Exhaust- Nozzles, of which the following is a specification.

The object of my invention is to construct a simple and efficient nozzle for the exhaustpipes of locomotives; and the invention consists in the features and details of construction hereinafter described and claimed.

In the drawings, Figure 1 is a front elevation, partly in section, of a smoke-box of a locomotive, showing the position of my irnproved nozzle; Fig. 2, a cross-section on line 2 2 of Fig. 3, looking in the direction of the arrows; Fig. 3, a vertical central section of the nozzle, and Fig. 4i a similar section taken on line 4 4 of Fig. 3.

A is the smoke-box, B the stack, C C the cylinders, C C the exhaust-pipes, and D the nozzle. This nozzle is made substantially in the form shown in the drawings, wherein it consistsof a casting, the lower part whereof is divided into two chambers or passages d CZk by means of a partition d. "When the nozzle is placed in position for use, the passages respectively connect, as shown, with the exhaust-pipes C. At its upper end the partition is expanded to form a cylindrical stem E, and upon this stem slides a cylinder F. At the upper end of the passages d the casting is contracted, and then tapers or runs upward at a slight incline, as shown at e. The shell of the nozzle then preferably expands again, forming a chamber G, and then contracts and forms a tapering extension, as at g.

The cylinder F is made substantially in the form -shown in the drawings, iitting upon the stem E and increasing in diameter at the points opposite the taperedportions of the shell e and g, as shown at e and d. By means of this construction annular passages II and I are formed between the cylinder and shell. The cylinder F may be moved up and down upon the stem, and two means are shown for adjusting it thereon, one consisting of a set-screw J, passing through the outer shell of the casting and bearing against the side of the cylinder. In this form the cylinder may be slid up and down by hand and held in the cylinder.

Vby means of a lever K, connected by a link 7c with a bar 7c', preferably cast integral with This lever isv connected by means of suitable rods with the cab of the locomotive, so that the engineer can adjust the cylinder to any desired height. To prevent the escape of steam at the point where the lever passes through the casting, I extend the partition d out to the sides of the casting, as shown at c. As the cylinder is moved up and down, it decreases or increases the size of the annular openings H and I, thereby varying the intensity of the blast of the exhausting steam. The area of the opening H must always be substantially equal to the area of the opening I, since if the opening I-I were larger than the opening I the steam exhausting from one cylinder would tend to pass back into the other, creating back-pressure; but by having the openings of the same size all backpressure is eifectually avoided. The nozzle is attached to the upper end of the exhaust-pipes C C', one of the passages d bef ing connected with each of such pipes. As the steam escapes from the pipes, it passes up through the nozzle,through the annular openings H and I. and is then guided by the tapering extension g into the stack, the extension centralizing the steam with the stack, so that it may enter the same somewhat like a piston, filling the stack throughout its length and producing a constant but gentle vacuum in the smoke-arch. The relative sizes of the cylinder and shell at the points c e g g should be such that the area of the annular opening H should increase or decrease just as the area of the annular opening I increases or decreases, so that as the cylinder moves up and down the areas of these respective openings remain at all times substantially equal. this form of nozzle a constant Vacuum is produced, which is not varied by sudden increases or diminutions, and which is moreeffective than that produced by a common nozzle, experiments with this nozzle showing that it throws no fire and effects a great saving in fuel.

While I have termed the part F a cylinder and so claimed it, I do not intend to be understood as meaning thereby al slide which IOG is necessarily circular in cross-section, since the stem and cylinder need not be circular, but may be square or any other form in cross-seetion that may be desired, the form of these parts not being essential to the invention, and the word cylinder being used merely as a generic term for the movable member F, whatever its sha-pe. The advantage of having the two annular openings Il and I with the space between them wherein the steam may expand is that thereby the steam is steadied, as it were, and a more constant blast obtained than it is possible to get with a single opening.

I claim- 1. In an exhaust-nozzle, the combination of the passages d d, annular openings II and I, a stein E, and a cylinder F, adapted to be moved up and down upon such stem to simultaneously decrease or increase the size of the openings II and I, substantially as described.

2. In an exhaust-moule, the combination of an outer shell or casing divided at its lower part into two passages d d, contracted and: tapering at two point-s e g, a stem E, and a cylinder F, movable upon such stem and ex-` tending at tivo points e g', forming, With the tapering extensions e g of the casing, the annular passages I-I and I, whereby as the cylinder is moved up and down the size of these openings is simultaneously decreased or increased, substantially as described.

3. In an exhaust-nozzle, the combination of the passages (Z d, annular openings I-I and I, a stem E, a cylinder movable up and down upon such stein, and means for holding such cylinder in position When it has been raised or lowered to decrease or increase the size of the annular openings I-I and I, substantially as e 

